POU2AF1 and B-cell non-Hodgkin lymphoma: Yin et al. [24] selected 34 cases of previously diagnosed B cell lymphomas with no or weak expression of CD20, CD79a, and PAX5 and found Oct2 and Bob1 to be positive in 74 % (25 of 34) and 85 % (29 of 34) of the cases, respectively.